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For a sample 1000 Twitter users, Elon Musk's research department reports an average age of 39. If the population standard deviation is 9.5 years, what

For a sample 1000 Twitter users, Elon Musk's research department reports an average age of 39. If the population standard deviation is 9.5 years, what would be the upper bound for a 90% confidence interval estimate of the mean age of all Twitter users?

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